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https://gitlab.com/libvirt/libvirt.git
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vircgroup: extract v1 detect functions
Reviewed-by: Fabiano Fidêncio <fidencio@redhat.com> Reviewed-by: Ján Tomko <jtomko@redhat.com> Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
This commit is contained in:
Pavel Hrdina
parent
47941ea7f5
commit
42a3fcc02b
@ -231,82 +231,6 @@ virCgroupPartitionEscape(char **path)
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}
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static int
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virCgroupResolveMountLink(const char *mntDir,
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const char *typeStr,
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virCgroupControllerPtr controller)
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{
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VIR_AUTOFREE(char *) linkSrc = NULL;
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VIR_AUTOFREE(char *) tmp = NULL;
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char *dirName;
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struct stat sb;
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if (VIR_STRDUP(tmp, mntDir) < 0)
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return -1;
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dirName = strrchr(tmp, '/');
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if (!dirName) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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_("Missing '/' separator in cgroup mount '%s'"), tmp);
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return -1;
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}
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if (!strchr(dirName + 1, ','))
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return 0;
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*dirName = '\0';
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if (virAsprintf(&linkSrc, "%s/%s", tmp, typeStr) < 0)
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return -1;
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*dirName = '/';
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if (lstat(linkSrc, &sb) < 0) {
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if (errno == ENOENT) {
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VIR_WARN("Controller %s co-mounted at %s is missing symlink at %s",
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typeStr, tmp, linkSrc);
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} else {
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virReportSystemError(errno, _("Cannot stat %s"), linkSrc);
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return -1;
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}
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} else {
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if (!S_ISLNK(sb.st_mode)) {
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VIR_WARN("Expecting a symlink at %s for controller %s",
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linkSrc, typeStr);
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} else {
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VIR_STEAL_PTR(controller->linkPoint, linkSrc);
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}
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}
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return 0;
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}
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static bool
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virCgroupMountOptsMatchController(const char *mntOpts,
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const char *typeStr)
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{
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const char *tmp = mntOpts;
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int typeLen = strlen(typeStr);
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while (tmp) {
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const char *next = strchr(tmp, ',');
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int len;
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if (next) {
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len = next - tmp;
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next++;
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} else {
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len = strlen(tmp);
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}
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if (typeLen == len && STREQLEN(typeStr, tmp, len))
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return true;
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tmp = next;
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}
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return false;
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}
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/*
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* Process /proc/mounts figuring out what controllers are
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* mounted and where
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@ -314,7 +238,6 @@ virCgroupMountOptsMatchController(const char *mntOpts,
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static int
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virCgroupDetectMounts(virCgroupPtr group)
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{
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size_t i;
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FILE *mounts = NULL;
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struct mntent entry;
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char buf[CGROUP_MAX_VAL];
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@ -327,34 +250,11 @@ virCgroupDetectMounts(virCgroupPtr group)
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}
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while (getmntent_r(mounts, &entry, buf, sizeof(buf)) != NULL) {
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if (STRNEQ(entry.mnt_type, "cgroup"))
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continue;
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for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
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const char *typestr = virCgroupControllerTypeToString(i);
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if (virCgroupMountOptsMatchController(entry.mnt_opts, typestr)) {
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/* Note that the lines in /proc/mounts have the same
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* order than the mount operations, and that there may
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* be duplicates due to bind mounts. This means
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* that the same mount point may be processed more than
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* once. We need to save the results of the last one,
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* and we need to be careful to release the memory used
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* by previous processing. */
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virCgroupControllerPtr controller = &group->controllers[i];
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VIR_FREE(controller->mountPoint);
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VIR_FREE(controller->linkPoint);
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if (VIR_STRDUP(controller->mountPoint, entry.mnt_dir) < 0)
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goto cleanup;
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/* If it is a co-mount it has a filename like "cpu,cpuacct"
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* and we must identify the symlink path */
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if (virCgroupResolveMountLink(entry.mnt_dir, typestr,
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controller) < 0) {
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goto cleanup;
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}
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}
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if (group->backend->detectMounts(group,
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entry.mnt_type,
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entry.mnt_opts,
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entry.mnt_dir) < 0) {
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goto cleanup;
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}
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}
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@ -428,7 +328,6 @@ virCgroupDetectPlacement(virCgroupPtr group,
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pid_t pid,
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const char *path)
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{
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size_t i;
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FILE *mapping = NULL;
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char line[1024];
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int ret = -1;
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@ -468,30 +367,9 @@ virCgroupDetectPlacement(virCgroupPtr group,
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controllers++;
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selfpath++;
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for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
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const char *typestr = virCgroupControllerTypeToString(i);
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if (virCgroupMountOptsMatchController(controllers, typestr) &&
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group->controllers[i].mountPoint != NULL &&
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group->controllers[i].placement == NULL) {
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/*
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* selfpath == "/" + path="" -> "/"
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* selfpath == "/libvirt.service" + path == "" -> "/libvirt.service"
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* selfpath == "/libvirt.service" + path == "foo" -> "/libvirt.service/foo"
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*/
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if (i == VIR_CGROUP_CONTROLLER_SYSTEMD) {
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if (VIR_STRDUP(group->controllers[i].placement,
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selfpath) < 0)
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goto cleanup;
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} else {
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if (virAsprintf(&group->controllers[i].placement,
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"%s%s%s", selfpath,
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(STREQ(selfpath, "/") ||
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STREQ(path, "") ? "" : "/"),
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path) < 0)
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goto cleanup;
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}
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}
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if (group->backend->detectPlacement(group, path, controllers,
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selfpath) < 0) {
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goto cleanup;
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}
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}
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@ -45,6 +45,18 @@ typedef int
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(*virCgroupCopyMountsCB)(virCgroupPtr group,
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virCgroupPtr parent);
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typedef int
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(*virCgroupDetectMountsCB)(virCgroupPtr group,
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const char *mntType,
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const char *mntOpts,
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const char *mntDir);
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typedef int
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(*virCgroupDetectPlacementCB)(virCgroupPtr group,
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const char *path,
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const char *controllers,
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const char *selfpath);
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struct _virCgroupBackend {
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virCgroupBackendType type;
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@ -52,6 +64,8 @@ struct _virCgroupBackend {
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virCgroupAvailableCB available;
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virCgroupValidateMachineGroupCB validateMachineGroup;
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virCgroupCopyMountsCB copyMounts;
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virCgroupDetectMountsCB detectMounts;
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virCgroupDetectPlacementCB detectPlacement;
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};
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typedef struct _virCgroupBackend virCgroupBackend;
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typedef virCgroupBackend *virCgroupBackendPtr;
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@ -23,6 +23,7 @@
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#if defined HAVE_MNTENT_H && defined HAVE_GETMNTENT_R
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# include <mntent.h>
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#endif
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#include <sys/stat.h>
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#include "internal.h"
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@ -37,6 +38,7 @@
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#include "virlog.h"
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#include "virstring.h"
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#include "virsystemd.h"
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#include "virerror.h"
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VIR_LOG_INIT("util.cgroup");
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@ -180,12 +182,168 @@ virCgroupV1CopyMounts(virCgroupPtr group,
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}
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static int
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virCgroupV1ResolveMountLink(const char *mntDir,
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const char *typeStr,
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virCgroupControllerPtr controller)
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{
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VIR_AUTOFREE(char *) linkSrc = NULL;
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VIR_AUTOFREE(char *) tmp = NULL;
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char *dirName;
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struct stat sb;
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if (VIR_STRDUP(tmp, mntDir) < 0)
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return -1;
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dirName = strrchr(tmp, '/');
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if (!dirName) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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_("Missing '/' separator in cgroup mount '%s'"), tmp);
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return -1;
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}
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if (!strchr(dirName + 1, ','))
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return 0;
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*dirName = '\0';
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if (virAsprintf(&linkSrc, "%s/%s", tmp, typeStr) < 0)
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return -1;
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*dirName = '/';
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if (lstat(linkSrc, &sb) < 0) {
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if (errno == ENOENT) {
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VIR_WARN("Controller %s co-mounted at %s is missing symlink at %s",
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typeStr, tmp, linkSrc);
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} else {
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virReportSystemError(errno, _("Cannot stat %s"), linkSrc);
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return -1;
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}
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} else {
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if (!S_ISLNK(sb.st_mode)) {
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VIR_WARN("Expecting a symlink at %s for controller %s",
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linkSrc, typeStr);
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} else {
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VIR_STEAL_PTR(controller->linkPoint, linkSrc);
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}
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}
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return 0;
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}
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static bool
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virCgroupV1MountOptsMatchController(const char *mntOpts,
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const char *typeStr)
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{
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const char *tmp = mntOpts;
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int typeLen = strlen(typeStr);
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while (tmp) {
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const char *next = strchr(tmp, ',');
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int len;
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if (next) {
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len = next - tmp;
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next++;
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} else {
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len = strlen(tmp);
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}
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if (typeLen == len && STREQLEN(typeStr, tmp, len))
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return true;
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tmp = next;
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}
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return false;
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}
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static int
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virCgroupV1DetectMounts(virCgroupPtr group,
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const char *mntType,
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const char *mntOpts,
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const char *mntDir)
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{
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size_t i;
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if (STRNEQ(mntType, "cgroup"))
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return 0;
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for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
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const char *typestr = virCgroupV1ControllerTypeToString(i);
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if (virCgroupV1MountOptsMatchController(mntOpts, typestr)) {
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/* Note that the lines in /proc/mounts have the same
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* order than the mount operations, and that there may
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* be duplicates due to bind mounts. This means
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* that the same mount point may be processed more than
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* once. We need to save the results of the last one,
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* and we need to be careful to release the memory used
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* by previous processing. */
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virCgroupControllerPtr controller = &group->controllers[i];
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VIR_FREE(controller->mountPoint);
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VIR_FREE(controller->linkPoint);
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if (VIR_STRDUP(controller->mountPoint, mntDir) < 0)
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return -1;
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/* If it is a co-mount it has a filename like "cpu,cpuacct"
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* and we must identify the symlink path */
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if (virCgroupV1ResolveMountLink(mntDir, typestr, controller) < 0)
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return -1;
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}
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}
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return 0;
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}
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static int
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virCgroupV1DetectPlacement(virCgroupPtr group,
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const char *path,
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const char *controllers,
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const char *selfpath)
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{
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size_t i;
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for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
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const char *typestr = virCgroupV1ControllerTypeToString(i);
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if (virCgroupV1MountOptsMatchController(controllers, typestr) &&
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group->controllers[i].mountPoint != NULL &&
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group->controllers[i].placement == NULL) {
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/*
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* selfpath == "/" + path="" -> "/"
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* selfpath == "/libvirt.service" + path == "" -> "/libvirt.service"
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* selfpath == "/libvirt.service" + path == "foo" -> "/libvirt.service/foo"
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*/
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if (i == VIR_CGROUP_CONTROLLER_SYSTEMD) {
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if (VIR_STRDUP(group->controllers[i].placement,
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selfpath) < 0)
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return -1;
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} else {
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if (virAsprintf(&group->controllers[i].placement,
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"%s%s%s", selfpath,
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(STREQ(selfpath, "/") ||
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STREQ(path, "") ? "" : "/"),
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path) < 0)
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return -1;
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}
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}
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}
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return 0;
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}
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virCgroupBackend virCgroupV1Backend = {
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.type = VIR_CGROUP_BACKEND_TYPE_V1,
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.available = virCgroupV1Available,
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.validateMachineGroup = virCgroupV1ValidateMachineGroup,
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.copyMounts = virCgroupV1CopyMounts,
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.detectMounts = virCgroupV1DetectMounts,
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.detectPlacement = virCgroupV1DetectPlacement,
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};
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